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Transcript of Chemistry 101 with Professor Fredricksen

Chemistry 101 with Professor Fredricksen Lesson 7 - Naming Ionic Compounds By: Alyssa Milano and Kathy NghiemCourse: SCH3UTeacher: Daigle Bagel (the Leprechaun)Date: October 10, 2012 There are two types of ionic compounds in the IUPAC (International Union of Pure and Applied Chemistry) system. 1) Binary ionic compounds contains only two different elements. 2) Polyatomic ionic compoundscontains a metal cation and a polyatomicion. Follow me! Good afternoon, my name is Russel and I am a wilderness explorer.What are you talking about? Well Russel, let meexplain on my handy chalkboard. SQUIRREL !!! Steps to Success for Naming Regular Binary Ionic Compounds:

1) Separate the two elements.

2) Cross over from bottom to top.

3) Add the charges. REMEMBER: the first one (metal) is positiveand the second (non-metal) is negative.

4) Write the name of the element, the metal stays the same but the non-metal changes it's ending to "ide." So Russel, I'm guessing you still don't understand ... let me give you some examples. Example 1: Name the following ionic compound. Ba3N2 1) Separate the two elements. Ba3 Barium N2 Nitrogen(metal) (non-metal) 2) Cross over from bottom to top. Ba3 N2 Ba2 N3 3)Add the charges.REMEMBER: the first one (metal) is positive and the second (non-mental) is negative. Ba2+ N3- *** Make sure the charges match those foundin the periodic table. *** 4) Write the name, the metal stays the same but the non-metal changes it's ending to "ide." Ba3N2

Barium nitride Professor Fredricksen!I THINK I GET IT!! :D That is excellent to hear Russel, but I'm afraid that there is much more to learn. Oh yes, what Professor Fredricksenjust taught was naming ionic compounds but there is still naming multivalent metals in ionic compounds. ????????? That is right, Dug. With multivalent metals, we write the oxidation number as a roman numeral and put it in brackets after the name of the metal. NOTE: When both elements havethe same number but different charges,the charge and number cancels out.ex: Boron Phosphide -> B3+ P3- = BP Steps to Success for Naming MultivalentMetals in Ionic Compounds:

4)Check the charge for the metal. The number will be written in Roman numerals between the metal and non-metal names and add "ide" to the ending of the non-metal. The bracket system makes it very easy to find the formulas of transition metal compounds, since we are given the oxidation number for the metal ion! We only have to predict the charge on the non-metal as usual, using the periodic table. We then use the crossover rule as usual to get the formula. ?????????? I know, Kevin. Its a lot a wordsfor you but don't worry. Let me give you an example. Example 2: Name the following multivalent ionic compound. Fe2O3 Metal: Iron (Fe) Non-metal: Oxygen (O) 1) Identify the metal and non-metal by looking at the periodic table. 3) Write symbols and charges. REMINDER: CHECK PERIODIC TABLE. The rectangle displays where the transition metals are located on the periodic table. This is where most of the elements that contains 2 charges are located. Fe2+/3+ O2- PROBLEM: IRON IS A TRANSITION METAL, THAT MEANS IT HAS 2 DIFFERENT CHARGES. SO WHICH ONE DO WE USE? PROCESS TO STEP 4. 2) Cross over charges from bottom to top. Fe203 Fe3 O2 4) Check the charge for the metal and the number will be written in Roman numerals between the metal and non-metal names and add "ide" to the ending of the non-metal. Since we confirmed that in the periodic table, iron (Fe) has the charge of 3+, we can know use it for this step. Fe3+ O2- iron (III) oxide Now gang, I hope youunderstood this lesson because weare now going to havea quiz. :O Binary ionic compounds: